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lazy url reverse()

Author:
guettli
Posted:
December 7, 2007
Language:
Python
Version:
1.3
Tags:
decorator reverse lazy
Score:
2 (after 2 ratings)

Since the decorators of your views are evaluated during parsing urls.py you have an 'chicken - egg' problem. The method reverse() can't be used since urls.py is not read.

This snippets evaluates reverse() lazy.

Related ticket: 5925

Django 1.4 (current trunk) has a lazy reverse.

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# file lazy.py
from django.core import urlresolvers

class lazy_string(object):
    def __init__(self, function, *args, **kwargs):
        self.function=function
        self.args=args
        self.kwargs=kwargs
        
    def __str__(self):
        if not hasattr(self, 'str'):
            self.str=self.function(*self.args, **self.kwargs)
        return self.str

def reverse(*args, **kwargs):
    return lazy_string(urlresolvers.reverse, *args, **kwargs)

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